reorganize modules

modules/core_scripts/ext/table.lua

@@ -0,0 +1,34 @@
+function table.dump(t, depth)
+  if not depth then depth = 0 end
+  for k,v in pairs(t) do
+    str = string.rep(' ', depth * 2) .. k .. ': '
+    if type(v) ~= "table" then
+      print(str .. tostring(v))
+    else
+      print(str)
+      table.dump(v, depth+1)
+    end
+  end
+end
+
+function table.copy(t)
+  local res = {}
+  for k,v in pairs(t) do
+    res[k] = v
+  end
+  return res
+end
+
+function table.selective_copy(t, keys)
+  local res = { }
+  for i,v in ipairs(keys) do
+    res[v] = t[v]
+  end
+  return res
+end
+
+function table.merge(t, src)
+  for k,v in pairs(src) do
+    t[k] = v
+  end
+end